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"The #PetkauEffect, by #RalphGraeub tells how 👉#radioactivity has harmed trees and forests: "It is assumed that the decisive physiological damage resulting in current forest death must have begun during the 1950's.👈 This is depicted in a reduction in density and width of tree rings, and in reduced growth, which is true in the Northern Hemisphere and in the Himalayas.... Neither aging,...